 * {
     margin: 0;
     padding: 0;
 }

 a {
     text-decoration: none;
     cursor: pointer;
 }

 body {
     background: linear-gradient(90deg, rgb(0, 255, 0), rgb(0, 255, 255));
 }

 .w {
     margin: auto;
     width: 800px;
 }

 .nav {
     position: fixed;
     TOP: 15PX;
     height: 32px;
     width: 800px;
 }

 a img {
     float: left;
     line-height: 100%;
 }

 h1 {
     float: left;
     margin-left: 10px;
     width: 100px;
     height: 32px;
     font-size: 18px;
     text-shadow: 2px 2px 3px #444;
     line-height: 38px;
     font-family: 'Courier New', Courier, monospace;
     color: black;

 }

 .nav-right {
     float: right;
 }

 ul li {
     display: inline-block;
 }

 .nav-column>li {
     float: left;
     padding-right: 10px;
     padding-left: 10px;
     overflow: hidden;
     width: 80px;
     height: 20px;
     line-height: 20px;
     text-align: center;
     font-size: 12px;
     font-weight: 700;
     border-right: 1px solid #666666;
     cursor: pointer;
 }


 .nav-column li ul {
     width: 100%;
     height: auto;
 }

 .nav-column li ul li {
     display: block;
     border-top: 1px solid #666666;
     background-color: rgba(126, 175, 175, 0.2);
 }

 .nav-column li ul li input {
     font-weight: 700;
     border: none;
     background-color: rgba(126, 175, 175, 0);
     cursor: pointer;
 }

 .nav-column>li:last-child {
     border: none;
 }

 .main {
     width: 100%;
     height: 1200px;
 }

 .main-body {
     position: relative;
     display: flex;
     flex-direction: row;
     width: 800px;
     height: 600px;
     margin-top: 150px;
     background-color: #fff;
     box-shadow: 4px 4px 10px #666;
 }

 .main-body-left {
     display: flex;
     flex: 1;
     flex-direction: column;
     align-items: center;
     justify-content: center;
     background-color: rgb(0, 255, 99);
 }

 .main-body-left h3 {
     display: flex;
     justify-content: center;
     font-size: 30px;
     font-weight: 500;
     text-shadow: 2px 2px 3px #444;
 }

 .main-body-left * {
     margin-bottom: 30px;
 }

 .main-body-left input:not(first-chird) {
     outline: none;
     width: 200px;
     height: 30px;
     border: 1px solid rgb(0, 255, 12);
     background-color: rgba(252, 252, 252, 0.3);
     text-indent: 10px;
     border-radius: 5px;
 }

 #main-body-left-button {
     color: black;
     text-indent: 0;
 }

 .main-body-right {
     display: flex;
     flex: 1;
     flex-direction: column;
     align-items: center;
     justify-content: center;
     background-color: rgb(0, 255, 153);
 }

 .main-body-right h3 {
     display: flex;
     justify-content: center;
     font-size: 30px;
     font-weight: 500;
     text-shadow: 2px 2px 3px #444;
 }

 .main-body-right * {
     margin-bottom: 30px;
 }

 .main-body-right input:not(first-chird) {
     outline: none;
     width: 200px;
     height: 30px;
     border: 1px solid rgb(0, 255, 12);
     background-color: rgba(252, 252, 252, 0.3);
     text-indent: 10px;
     border-radius: 5px;
 }

 #main-body-right-button {
     color: black;
     text-indent: 0;
 }

 .main-body-mask {
     position: absolute;
     display: flex;
     left: 0px;
     flex-direction: column;
     justify-content: center;
     align-items: center;
     width: 50%;
     height: 100%;
     background-color: rgb(0, 255, 99);
 }

 .main-body-mask * {
     margin-bottom: 40px;
 }

 .main-body-mask img {
     width: 150px;
     height: 150px;
     background-size: cover;
     border-radius: 50%;
 }

 .main-body-mask .direction {
     position: absolute;
     left: 50%-40px;
     top: 30px;
     font-size: 80px;
 }